For the rest of us, the only knowledge we have of the inside is what we've seen in the movies, and as you can imagine, their version isn't all that accurate. My name is Cedric Coleman, and I spent seven years as a prison guard in two different states. In that time, I learned ...

#7. The Cruel/Sadistic Guards Don't Last

You know how every prison movie has that guard who's just an asshole and/or a sadist? There was Captain Hadley in The Shawshank Redemption, and Percy Wetmore in The Green Mile. The guards have absolute power, so why not torture the inmates at every opportunity?

In real life, that doesn't end well.

Unless "a jagged spoon" counts as "well."

We had one lieutenant come in and treat the inmates like dirt, calling them names and acting like the hardass guards from the movies. What he didn't account for is how much time you have to spend alone with these guys.

One day, he went to investigate a fight between two inmates, but it turned out to be a diversion. Two other inmates came up from behind and ambushed him. He was stabbed 61 times before he could signal the officer in the control room to open the door and let him in. He survived, but he's not exactly running marathons these days (side note: it's actually pretty hard to stab someone to death).

Definitely a three-man job.

The point is, there is nothing to be gained by antagonizing a pissed-off lifer who has no problem twisting knives in you and spitting or rubbing shit in your wounds. (You know those prison stabbing scenes in Breaking Bad? That was years of violence shoved into a montage, but it looked just about right.) Our job isn't to punish these guys -- the prison is their punishment. You might feel like a badass in the uniform, but that felon with the makeshift knife is a real badass. See, that's why he's in prison.

Obviously this doesn't mean that you have to become their friends. That happens, too -- some officers end up forging a "bond" with inmates, and more often than not, that "bond" ends with the guards smuggling drugs for them ... or straight-up fucking them. I walked out a lot of staff for getting involved with inmates. Hell, just ask Google how common this sort of thing is:

It's like dating on the Internet, but a little more respectable.

If I'm making it sound like the inmates are in charge, you have to understand that ...

#6. The Guards Are at a Disadvantage

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Many prison guards see themselves as part of a thin, ragged line between violent, lawless men and civilized society. The prisoners, on the other hand, think of the guards as Netflix. They're never more than one poke away from entertainment. We are the prison's stage show, and most of us don't even realize it.

These guys watch us 24 hours a day, seven days a week. They overhear our conversations, they notice when we're stressed out ... and they take advantage of that. One guard might spill his heart to another guard about his impending divorce without realizing that the prisoner working as a janitor in the next room is listening in. Then that dude sells the information to an inmate with a grudge, and boom, the whole prison knows Sgt. Peters couldn't satisfy his wife.

You could spend two or three weeks working a day shift and then get shoved over to a graveyard shift at a moment's notice. It affects you -- exhaustion slows down your reflexes, and guys with slow reflexes don't do so great against well-rested dudes rushing them with knives. Well, the inmates know when our schedules change, and they take advantage of that, too. Again, they're always watching. Looking for a weakness.

Thinkstock/Stockbyte/Getty ImagesEven when Jeopardy's on.

So imagine you're one officer with a hundred murderers and rapists wandering around you. And you don't know what every guy is in there for. You might end up pissing someone off and realize later that he's a gang leader or a multiple murderer. I knew a guard who got on an inmate's bad side without ever knowing why. She was just pulled into a cell one day and had the shit beaten out of her.

It doesn't help that usually corrections officers are people who wanted to be police officers but, for whatever reason, weren't able to do that. Anger management issues, for instance, are very common. You might recognize "anger management" as a personal issue that maybe doesn't belong in someone whose entire job is to keep the peace. Add that to the low pay, constantly being shit-talked by inmates, and frequent stabbings, and you'll understand why the Bureau of Prisons is 3,200 guards short right now.

Thinkstock/Stockbyte/Getty Images"... so you guys watch the other gang, they'll watch you, and we'll come by once a week to pick up the bodies."

I worked in prisons owned by CCA, the Corrections Corporation of America. You'd think private prisons would have more money, nicer gear, and other benefits, but CCA was all about cutting corners. They didn't even issue each man a personal radio, which should be a requirement in any office where being shanked is a daily concern. Instead, the radios stayed at our stations, safely out of reach of anyone who might need them. Oh, and they paid us less than the state prison guards, too.

#5. The Inmates Are Incredibly Organized

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Inmates train for riots. At yard time, you'll see a ton of them doing martial arts together. Sometimes they'll start a fight with three or four guys just to see what our response is, that way they're able to work up a counter for it. They figure out what our moves are, and then they practice their methods for beating us while we watch. You'd think we might be able to turn that right around and train to counter their new methods, but, again, there's no money for training.

Kevork Djansezian / GettyWe can't even afford shirts for all the prisoners.

We do have some tools to fight back, but they have to be used on us before we're allowed to use them. So the guards have to get pepper balled, which is not as hilarious as it sounds: A pepper ball is a shotgun round loaded with pepper spray, and it just sucks. So hard. (Note: The pepper spray we use in prisons will eat the bottom right out of a Styrofoam cup -- imagine it in your eyes.)

But even that isn't much of a deterrent -- remember, there's simply no way to punish the worst of these guys. If you have a 25-to-life sentence, what am I going to do to make that worse? An inmate killing an inmate will usually get 30 to 50 days of segregation. Those inmates who beat up that female guard? They had five years added to their life sentences. It's completely meaningless -- if you're a lifer, prison might as well be a license to kill.

That's one of the reasons we let them have things like Xboxes and PlayStations. If you give them video games, they'll be less likely to start fights. So once a week we'd hook up a bunch of TVs in a classroom so all of the murderers and rapists could play Halo. There's nothing more interesting than seeing guys who have killed multiple people deathmatching each other. Teabagging seems a lot less innocent when you know it might end with one of the aforementioned riots.